'Lemme pet your squirrel' is meant to say to someone who has an attractive moustache, and you just want to touch it. Preferably, pet it. Also, it is as bushy or curly as a squirrel's tail.
As I saw John's moustache, all I thought was "Lemme pet your squirrel".
a game started at LBJ High School. Rules: If someone around you does something dumb you say "lemme get it" which is accompanied by a hand motion; an open palm, face up, bring the fingers towards you two or three times, then you slap that person on the head.
Tom: Omg a bird just pooped on my car.
Stefan: AHA lemme GET!